Resiliently mounted disk tiller



NOV. 4, 1952 JOHNSTON 2,616,352

RESILIENTLY MOUNTED DISK TILLER Filed Aug. 15, 1947 2 SHEETSSHEET lINVENTOR. HowARn MJmms TON ATTOE/VEY Nov. 4, 1952 H. JOHNSTON 2,616,352

RESILIENTLY MOUNTED DISK TILLER Filed Aug. 15, 1947 2 SHEETSSHEET 2INVENTOR.

How/420 I"). domvsrolv BY 4 W,

ATTORNEY Patented Nov. 4, 1952 "UNITED PATENT OFFIC 'HowardiMJohnston,Toronto, Ontario, Canada, "assignor to'Massey-Harris Co.'Ltd., Toronto,Ontario, Canada, a corporationof Canada Application August 15, 1947,Serial No. 768,867

(Cl m- 153) .il'gClaim.

The present invention is-adapted tax-be: usedas an attachmenton 'disc'tillers such asisa illustrated in my application-for=patent,Serial'-Num- -ber523,131, filed February l9, l944,-:whichmatured into'U.*S. Patent No.- 2,426,354:and issued August 26, 1947,entitled Disc 'Iiller. In this' design the frame has-considerable.weight: and the discs are held definitely to a certain depth:=re1ativeto the frame. Therefore whentilling stony ground with a large stone nearor at the surf-ace of the ground its contact-with adisc or discs placesa great strain on the mechanism because of the Weightof 'theframe.

out adding very greatly to .the cost ofthe-device.

Objects of the present-invention are toprovide means whereby theyielding means may bemade inoperative by the .simp1e,.use:of:;anadditional bolt and whereby the yieldingemeansrmay be manually adjusted.

'To these'and'other usefulxendsmy invention consists of parts,combinations of-parts or their equivalents and mode of "operation; ashereinafter described: and claimedand showninithe accompanying drawingsinewhich:

Fig. l is a top .viewpfa disc tiller asshownin my United States Patent-,No. 2,42.6,354;;and equipped with my stone; jumpin device.

Fig. 2 is a fractional left end vlew of 'the-.-.device shown in Figure1.

Fig. 3 isan enlarged leftasidei sectional view of the present-inventionin a normaloperating position.

Fig. 4 is a View similargto Figure 3 except illustrating the. action. ofthe device when ,the ,discs are forced to ride over an obstruction.

Fig. 5 is a section taken; on lines:.5#5 .of=-.Eigure 3.

Fig. 6 is a section taken onilines-i- -s-of 'Figure 5.

Fig. 7 isan enlarged elevational iviewnsim-ilar to Figure 5 ofmyyUnited-r States Patent No. 2,426,354.

As thus illustrated the disc gang is designated by reference-character.A and the -left end frame of the device is designated in itsentirety by reference characterB. "The hitch of my gdevicein itsentirety is designated by reference character C. 1

Member A comprises arelatively large tube .10 having spaced arms I! which.,are securedto the tube, the rear ends being'suitably connectedtodisc gang bearings "l2. "Discs13'are securedto a *sh'aft'which isrotatably mounted in bearings 12.

Tube I is rotatably mounted on a main frame member or shaft .1 5,. the.shaft formingv a rigid connection between member B and .a bracket. [6 towhich -.a carryingand guiding; wheel. I!v is rotatablyattached bysmeans.of-an.axle I8, the axle having secured-thereto an armi l9. Hitch mem-:ber C hassadraw. link20 which is pivotally attached. as .at 2 l,. itsfrontpbeing adapted .to be attached .-tothe draw bar .of-.a tractor andhav- -.ing.a-:link connection: 22 to arm l9 whereby wheel .H :Will? beguided, inits direction of ,travel by thetractor, through.1inkp20. ,Therear end of member- B has a bracket 25 (see Figure ,2) into whichanaxle, 26 is vertically ,pivotally mounted, theaxle at its rear endhaving rotatably mounted thereona rear furrow carrying wheel 27.

Wheels Hand 2'lz-,have-means..for vertical. adjustment relative tobracket. 16:;and member .25.

.The, forward end of member B has rotatably mounted thereon a land wheel28 with a power lift; clutch 29 having a crank 30 with connectionswhereby; thediscs ,l3 may be-raised and lowered to incp a neand. e aepos io y-tu n tube jllon frame member 15,. and having a for- ..wa-rdlyextending shaft 3I- -whereby the operator from the seat-on thetractormay; regulate the .depth cut by the disc-as in United States PatentItwill be seen that. wheel28 acts to definitely raiseandlower the discson; gang A. If a serious obstruction. is. met, for, example a largestone .whichis near .the surfaceof the ground, in order to ride over thestone the v.discjgang will be required to lift; either the front or rearend or both ends of the device, unless the machine is equipped with-mpresent invention.

, Applicants structureqas shown in the figures .is designed. so. theliftingof the discs eitherby an unyielding obstruction such. as a largestone near'the: surf-ace ofthe ground, I provide means 'wherebythe discswill be permitted to ride over "the obstruction by overcoming springssupplied for-the purpose'and without raising the frame of thedevice.

I will now describe my stone jumping attachmentormeans whereby the-discsare yieldingly held-to the -desired depth.

Referring specificallynow to Figures 3, 4, 5, 6 and K ln-Figure "7,I-haveillustrated a mechanism for raising and lowering the discs andmanually regulatingthe depth-of the-disc similar to that tshovvn insaid- United States- Patent 'No. 2,426,354. 1 1m Figures 1 through 6, Iillustrate my improved-means for-yieldingly holding the 3 discs in thepredetermined depth as determined by the power lift and manuallyoperated controlling means.

Crank 36 is adapted to make a one half turn every time lever 32 ispulled. When the crank is in its upper position the discs will be in anoperating position and when the crank is in its lowest position thediscs will be in an inoperating position as follows:

Two split brackets 33-33 are rotatably mounted on tube I0, each havesectors 34--34 integral therewith. Two upwardly extending, parallel arms35-35 are pivoted to sectors 34 as at 36. Sectors 34 each have a slot 31which is positioned on a radius with bolt 36. Arms 35 have bolts 38secured thereto which extend through slots 31 so members 33 may turn onbolts 36 as axes thus forming knuckle joints between members 33 and 35.A forwardly extending arm 45 is secured to pipe H]. A bracket 46 extendsdownwardly between arms 35 and having trunions 41 on opposite sideswhich extend through openings in arms 35. Member 46 has at its upper enda bevel gear housing 48, one of the bevel gears being operativelyconnected to shaft 3| and the other being screw threaded to a bolt 49which is pivotally connected to arm 45 as at 50 and extends freelythrough bracket 46 to the bevel pinion into which it is screw threaded.

Thus by turning shaft 3| tube may be turned on shaft I for manuallycontrolling the operatin position of the discs. Arms 35 are securedtogether at their upper ends by bracket 5| the bracket having aforwardly extending trunnion 52 which is operatively connected to crank30 by means of blocks 53 and 54 and a forked connecting link 55 theforks being pivoted to the blocks as at 56 and 51. The upper end of link55 is preferably screw threaded into the upper fork as at 58 asillustrated, for adjusting purposes and so crank 30 need not be parallelto tube l0.

Thus the position of arms 35 is determined by crank 30 and the positionof arm 45 relative to arms 35 is determined by shaft 3|. Clearly discs|3 are raised and lowered by the power lift and regulated manually bymeans of shaft 3|.

Arms 65 and 66 are secured to members 33 having at their forward endseye bolts 61. Brackets 68 are secured to the upper ends of arms 35 eachhaving eye bolts 69 with nuts 16. Eyebolts 61 and 69 have therebetweenpull springs 1|, the springs acting to pull upwardly on the forward endsof members 65 and 66 and urge members 33 clockwise. Nuts may be used foradjusting the tension of these springs, thus to regulate the yieldingpressure adapted to hold the discs in the ground and to hold bolts 38against the forward ends of slots 31.

It will be noted that the plane of pivot bolt 36 and trunnions 41 isslightly in front of the center of shaft |5 thus forming an offsetknuckle joint. Therefore when the discs are forced over a seriousobstruction the tendency of members 33 is to turn anti-clockwise againstthe pull of springs 1| (see Figure 4). It will be seen by scrutinizingFigure 3, that pivot bolt 56 is held in position by arms 35. Clearlysince pivot bolt 36 is only slightly forward of the center of shaft |5,it will require but moderate size springs to hold the discs in theirworking position.

Slots 31 determine the extreme positions of tube l0 and it willbe seenthat when the discs have passed over the obstructions the springs willagain force the discs to their original depth.

When it is desired to lock the discs against a yielding upward movementa bolt 12 (see Figure 6) is positioned in rear of members 35 and throughthe rear end of slots 31. The end of the slot through which bolt 12extends is clearly shown in Figure 3. Thus when this bolt is used, thedevice will operate exactly the same as U. S. Patent No. 2,426,354 or inthe design shown in Figure 7.

It will be seen that my improved stone jumping attachment may beconveniently installed on the disc tiller shown in U. S. Patent No.2,426,354, that many parts shown in Figure '7 are interchangeable withparts used on the present invention and that when so installed, whendesired the yielding means may be made inoperative; and that the deviceis simple, easily manufactured, easily understood and is efficient.

Clearly many minor detail changes may be made in the design shownwithout departing from the spirit and scope of my invention as recitedin the appended claim.

Having thus shown and described my invention, I claim:

In an automatic release for a disc tiller, a main frame shaft with acarrying wheel mounted on its front end and two carrying wheels mountedon its rear end, a tube rotatably mounted on said frame shaft havingrearwardly extending arms secured thereto and a disc gang rotatablymounted on the rear ends thereof, a half turn power clutch mounted onone of said carrying wheels and having an operating connection to saidtube for raising and lowering said disc gang by turning the tube, saidpower lift operating connection to said tube comprising in combination,a forwardly extending arm secured to said tube, brackets rotatablymounted on said tube and on opposite sides of the forwardly extendinarm, parallel and upwardly extending arms near the upper end of which isoperatively connected said power lift clutch, the rear lower end of saidparallel arms being pivoted to said brackets, the parallel arms beingoperatively connected to the forward end of said forwardly extendingarm, said brackets each having forwardly extending lever arms, springsoperatively connecting the forward ends of the lever arms and saidparallel arms near the upper end thereof, a stop associated with saidbrackets and the lower end of said parallel arms to stop said bracketsbefore said pivotal connection between said parallel arms and saidbrackets reaches dead center, whereby when said disc gang is forced toride over a serious obstruction, saidbrackets will be caused to rotateand overcome the pull of said springs and cause said bracket to travelforwardly and. permit said disc gangs to raise on the pivotal connectionof said forwardly extending arm as an axis, and whereby after the discspass over the obstruction, said springs will return the brackets anddisc gang to their operating positions.

HOWARD M. JOHNSTON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 640,858 Bartholomew Jan. 9, 19001,524,369 Ramage Jan. 27, 1925 2,426,354 Johnston Aug. 26, 1947

